drm/tegra: Add call to put_pid()

Add a call to put_pid() corresponding to get_task_pid().
host1x_memory_context_alloc() does not take ownership of the PID so we
need to free it here to avoid leaking.

Signed-off-by: Prateek Agarwal <[email protected]>
Fixes: e09db97 ("drm/tegra: Support context isolation")
[[email protected]: reword commit message]
Signed-off-by: Mikko Perttunen <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: Prateek Agarwal

drivers/gpu/drm/tegra/uapi.c

@@ -114,9 +114,12 @@ int tegra_drm_ioctl_channel_open(struct drm_device *drm, void *data, struct drm_
 		if (err)
 			goto put_channel;
 
-		if (supported)
+		if (supported) {
+			struct pid *pid = get_task_pid(current, PIDTYPE_TGID);
 			context->memory_context = host1x_memory_context_alloc(
-				host, client->base.dev, get_task_pid(current, PIDTYPE_TGID));
+				host, client->base.dev, pid);
+			put_pid(pid);
+		}
 
 		if (IS_ERR(context->memory_context)) {
 			if (PTR_ERR(context->memory_context) != -EOPNOTSUPP) {